This
Recommendation describes the functionality of a
decomposed multipoint control unit, in particular the interface
between a media controller and media processor which is based on ITU‑T
Rec. H.248. This Recommendation contains guidelines for the use of a
decomposed gateway that may support audio, video and data conferencing. This
Recommendation contains packages for floor control, volume control, video
windows, audio and video mixing for point-to-point, multi-cast and hybrid
conferencing scenarios.

Amendment
1 defines two new packages – the Text Overlay Package and the Border and
Background Package, which together with the Video Window Package may be used
to provide additional conference control capabilities.